Virtual vault of licensed content

ABSTRACT

A technique for content management involves storing runtime state of content externally. A system created according to the technique may include a state server that receives runtime state of content from a playback device, and provides the runtime state to that or another playback device upon request. A playback device constructed according to the technique may include a content state recovery engine for recovering runtime state that was previously stored externally to the playback device. A method according to the technique may include generating the runtime state locally, storing the runtime state externally, and re-acquiring the runtime state.

CROSS-REFERENCE TO RELATED APPLICATIONS

The present application submitted under 35 U.S.C. § 371 claims priority to International Application No. PCT/US2007/010797, with the International Filing Date of May 2, 2007, which claims priority to U.S. Provisional Patent Application No. 60/797,263, filed May 2, 2006, and which are incorporated herein by reference.

BACKGROUND

Mobile devices and other devices with a limited storage capacity are unable to store as much data as users of the device may like. Users of such devices may have a license to use more content than will fit on the device. When content is purchased online, this may become even more troublesome since the capacity of the device directly impacts the amount of content that users might be willing to download. In addition, the users may also generate some content that is associated with the user and/or the licensed content, which needs to be stored on a non-volatile device. This user-generated content may include state of progress in the game, point of achievement, assets, private information, etc.

In some applications, a user requests content by specifying a title (or its identity), and a server responds by providing content and a generated user license. In other words, content and user generated data may not be discarded without the risk of losing the state or the ability to execute or use the content in future.

When a user discards content, state associated with the content is also typically discarded. In some cases, when state for content or for lots of different content takes up a relatively large amount of space—even if the state could be saved when content was discarded—it may be desirable to discard the state to make room for new content and any state associated with the new content. When state is discarded, it is lost even if the user retains a license to the content and downloads the content again later. It would be beneficial to have a flexible mechanism for the management of storage and retrieval of the user's assets: his purchased content and state.

The foregoing examples of the related art and limitations related therewith are intended to be illustrative and not exclusive. Other limitations of the related art will become apparent to those of skill in the art upon a reading of the specification and a study of the drawings.

SUMMARY

The following embodiments and aspects thereof are described and illustrated in conjunction with systems, tools, and methods that are meant to be exemplary and illustrative, not limiting in scope. In various embodiments, one or more of the above-described problems have been reduced or eliminated, while other embodiments are directed to other improvements.

A technique involving a virtual vault to provide a mechanism for flexible management of users' assets is described. The technique involves utilizing a data structure, called an e-ticket, to associate a user with his assets: the purchased titles and user generated state files. This makes it possible for the user to discard the content of the title, for example to save space on a local storage device, but retain a license to the title. The title is associated with, for example, a title ID so that, later, the title content can be recovered from a “virtual vault” by using the title ID as an index. Similarly any state files, for example, game save data can be retrieved using the e-ticket.

Particularly, if content is secure, and the e-ticket is a signed data structure, vault services could be provided by a third party. An example of a recovery technique may involve providing a service that will translate a title ID into a location/download protocol (e.g., URL) that can be used to restore the content for the user.

Advantageously, a title may have application save data, or runtime state, that is generated as the user uses the title. A virtual vault service provider can provide services for the state to be uploaded when the title is discarded. By referencing the license to a title, which includes a binding between, the title, the user and/or device and the content, state can be restored when the title content is restored.

BRIEF DESCRIPTION OF THE DRAWINGS

Embodiments of the inventions are illustrated in the Figures. However, the embodiments and Figures are illustrative rather than limiting; they provide examples of the invention.

FIGS. 1A and 1B depict an example of a system including a virtual vault.

FIG. 2 depicts an exemplary block diagram of a virtual vault system.

FIG. 3 depicts an example of a flow diagram appropriate for the content management system of FIG. 1.

FIG. 4 depicts an example of a playback device including a content state recovery engine.

FIG. 5 depicts a flowchart of an example of a method in which a server could distribute content in a network including a playback device having limited storage capacity.

FIG. 6 depicts a flowchart of an example of a method for providing virtual vault services.

DETAILED DESCRIPTION

In the following description, several specific details are presented to provide a thorough understanding of embodiments of the invention. One skilled in the relevant art will recognize, however, that the invention can be practiced without one or more of the specific details, or in combination with other components, etc. In other instances, well-known implementations or operations are not shown or described in detail to avoid obscuring aspects of various embodiments, of the invention.

FIGS. 1A and 1B depict an example of a system 100 including a virtual vault. In the example of FIG. 1A, the system 100 includes a server 102, a platform 104, and a vault 106. The server 102, the platform 104, and the vault 106 are coupled to one another via a network 108. FIG. 1A is intended to illustrate an early stage (where the platform 104 has obtained a license for a single title from the server 102), and FIG. 1B is intended to illustrate a later stage (where the platform 104 has multiple licenses for titles and the vault 106 includes content associated with those licenses). Note that the vault may not contain physically separate content storage from the server. It is a virtual representation of the fact that the user of the platform has acquired rights to certain titles and can retrieve them. Since title content is common amongst a large set of users it need only be stored once.

In the example of FIG. 1A, the server 102 includes a plurality of title IDs 110-1 to 110-N (referred to collectively as title IDs 110), a plurality of titles 112-1 to 112-N (referred to collectively as titles 112), and a plurality of content 114-1 to 114-N (referred to collectively as content 114). The content 114 may include any known or convenient electronic content, including but not limited to movies, music, games, programs, objects, data, URLs, etc. A single title ID (e.g., title ID 110-1), title (e.g., title 112-1), and content (e.g., content 114-1) may be referred to as a record that is associated with the title or title ID. The records may be referred to as residing in a database on the server 102. The server 102 may include a variety of components that are not shown, including by not limited to a processor, a communications interface, an input/output controller and/or device, a display device, memory, non-volatile storage, etc.

In the example of FIG. 1A, the platform 104 includes the title 112-1, the content 114-1, and an E-ticket 116-1. The E-ticket 116-1 includes the title ID 110-1 and an identification of the user and/or the user's device. The title 112-1 is illustrated in FIG. 1A as “connected” to the E-ticket 116-1 with a line that is intended to represent an association. Similarly, the content 114-1 is illustrated in FIG. 1A as “connected” to the E-ticket 116-1 with a line that is intended to represent an association. The title ID 110-1, title 112-1, and content 114-1 are assumed to be a record from the database on the server 102. It may be noted that in an alternative embodiment the title or content on the platform could be slightly, significantly, or completely different from the record in the database on the server. However, for illustrative purposes, they are assumed to be the same in the example of FIG. 1A.

The platform 104 could be any of a variety of devices including but not limited to a mobile device, game console, pda, cellular phone, smart phone, computer, appliance, or other electronic device that includes a cache, memory, or storage on which to store content. An E-ticket is, for example, a license to any known or convenient electronic content. An E-ticket may be obtained when a user associated with the platform 104 enters into a transaction with an agent of the server 102 (or an agent affiliated with at least a portion of the database on the server 102).

In an embodiment, the E-ticket is for a title and for the content associated with the title. Advantageously, since the E-ticket is for both the title and for the content, the title and content are separable, though, in an embodiment, they remain linked by a common and at least somewhat unique title ID. Since the E-ticket is for both the title and for the content, the user may be able to discard the content to, for example, save space on a local storage device with limited capacity. The E-ticket may remain on the platform 104 so that the content can be recovered later from the vault 106, using the title ID as an index in a non-limiting embodiment.

A Vault is an entity that is capable of providing storage and retrieval services to a user in the system. The vault may be capable of processing inputs from a user, applying a set of rules, delivering output, and/or receiving input content or data. In the example of FIG. 1A, the vault 106 includes the title ID 110-1 and the content 114-1. In an alternative embodiment, the vault 106 could include the entire record associated with the title ID 110-1. In the example of FIG. 1A, the server 102, platform 104, and vault 106 are remotely located with respect to one another. However, in an alternative embodiment, the vault 106 and the server 102 could be local with respect to one another.

In various embodiments or implementations, the server 102 may provide the content 114-1 to the vault 106 before, during, or after a transaction where the platform 104 obtains the E-ticket 116-1. Alternatively, the platform 104 could provide the content 114-1 to the vault 106 before, during, or after a transaction where the platform obtains the E-ticket 116-1. Alternatively the vault may not store the content, but only a reference to the location of the content in another server. Any convenient provisioning schedule or implementation that would work for the intended purpose is envisioned.

In the example of FIG. 1B, the system 100 includes the platform 104 and the vault 106 (the server 102 and the network 108 are not shown). In the example of FIG. 1B, the vault 106 includes the title IDs 110 and the content 114. It should be noted that a subset of the title IDs 110 and the content 114 could be stored in the vault 106, and some of the title IDs and content could be from sources other than the server 102. So, long as the title ID is sufficiently unique, the records could be from any number of content sources.

In the example of FIG. 1B, the platform 104 includes the titles 112, a plurality of E-tickets 116-1 to 116-N (referred to collectively as E-tickets 116), and, for illustrative purposes, the content 114-2. The E-tickets 116 include respective ones of the title IDs 110.

In operation from FIG. 1A to FIG. 1B, the platform 104 obtains the E-tickets 116 in a known or convenient manner for the content 114. However, the platform 104 discards content associated with the E-tickets 116 for some reason. For example, the platform 104 may discard content because a user explicitly instructs the platform 104 to discard the content, the content may be discarded when the platform 104 is full (e.g., lack of available storage), the content may be discarded if it is unused for some period of time, or the content may be discarded for some other reason.

In an illustrative embodiment, the server might use cryptographically signed state to authenticate state, identify its user, and/or provide requested “storage/retrieval” services for the state.

Regardless of the reason, the platform 104 eventually, for illustrative purposes, only has content for the record associated with the title ID 110-2. The vault 106, on the other hand, retains records for all of the discarded content 114. In the example of FIG. 1B, the vault 106 also includes the record associated with the content 114-2, which has not been discarded. In a non-limiting embodiment, the vault 106 includes records for all content 114 for which the platform 104 (and, depending upon the implementation, other platforms) has a license

As an example, assume the platform 104 is going to obtain content 114-1 from the vault 106. If the platform 104 has insufficient storage, the platform 104 may discard the content 114-2. If storage is sufficient, the platform 104 may or may not discard the content 114-2. The platform 104 can provide the E-ticket 116-1 to the vault 106. The vault 106 may include a service that can translate the title ID 110-1 included in the E-ticket 116-1 into, by way of example but not limitation, a location or download protocol (e.g., a URL) that can be used to restore the content 114-1 on the platform 104.

In an embodiment, the vault 106 may be operated by a third party that provides the service. Moreover, if the content 114 is encrypted or otherwise secured, the third party need not even be capable of decrypting or unsecuring the content. In this case, the platform 104 will presumably include some means for decrypting the content 114, such as a key that is associated with one or more of the E-tickets 116.

A given record may have state associated with it, stored at the vault 106. When content associated with a title is discarded, the platform 104 may provide information to the vault 106, updating the state associated with the title. The state can be further updated when the content is later provided to the platform 104. Depending upon the implementation or embodiment, the state may or may not be updated independent of whether content is stored or retrieved.

FIG. 2 depicts an example of a content management system 200. The system 200 includes a license server 202, a content server 204, a state server 206, a playback device 208, and a network 210. Any of the components may be located remotely with respect to one another, or locally or relatively locally to one or more of the other components.

In the example of FIG. 2, the license server 202 is implemented in a computer-readable medium. The license server 202 may comprise hardware, software, firmware, or some combination thereof. As the name suggests, the license server 202 provides a license to devices, such as the playback device 208. In an illustrative embodiment, the licenses are provided across the network 210 to a requesting device. Alternatively, the license server 202 could also push a license to a non-requesting device. As another alternative, the license server 202 may maintain the license locally, and provide permissions associated with the license instead of sending a copy of the license.

Hereinafter, the term permissions is intended to include a license, a portion of a license, or rules associated with a license that can be used to obtain rights to content associated with the license. When the license server 202 sends permissions, the permissions may be encapsulated in an E-ticket. The E-ticket, in addition to the permissions, may include data such as a title ID to content associated with the permissions.

In a non-limiting embodiment, the E-ticket could manage the usage of content. For example, the E-ticket could include usage rules of the content including, but not limited to, restrictions placed upon the use of the content. Generally, an E-ticket describes information sufficient for the playback device 208 to use the content subject to the rights granted by the E-ticket, and possibly to authenticate the content. Each E-ticket could include a data structure associated with one or more content elements such as a title ID. The E-ticket could also provide for cryptographic techniques that may include (1) an encrypted key for that content, with the effect that the secure processor can access the content if it has access to the license, and (2) a digital signature or secure hash value, with the effect that the license cannot be easily altered and remain effective. The E-ticket could also include a description of those rights license grants to the licensee with regard to the content. The E-ticket could be individually tailored to each individual authorized recipient or user, and to the playback device for which that user is authorized.

The license server 202 may or may not include a relatively local license generator. The license generator could also include usage rules of the user of the playback device and user information such as personal information, UID information, a user subscription, and restrictions placed upon the user. The license generator may also obtain a title ID associated with the content retrieved from the content database 204.

In the example of FIG. 2, the content server 204 is implemented in a computer-readable medium. The content server 204 may comprise hardware, software, firmware, or some combination thereof. As the name suggests, the content server 204 provides content to devices, such as the playback device 208. In an illustrative embodiment, the content is provided across the network 210 to a requesting device. Although the content server 204 could, depending upon the implementation, provide content that does not require a license, for illustrative purposes in this description, content provided by the content server 204 is associated with a license generated by the license server 202.

Generally, content in the content server 204 may store any known or convenient electronic content, including but not limited to movies, music, programs, application software, audio/video presentations, databases, educational programs, games or educational games, media or multimedia content, teaching materials, objects, data, URLs, or reasonable combinations or generations thereof and the like. Content may be stored in files in a directory structure, as blocks for streaming, or in some other known or convenient manner. Content may be to be executed or interpreted (for code or instructions) or to be displayed or presented (for media content). As used herein, the term executed or run is intended to include any use of the content.

In the example of FIG. 2, the state server 206 is implemented in a computer-readable medium. The state server 206 may comprise hardware, software, firmware, or some combination thereof. In an illustrative embodiment, the state server 206 provides storage/retrieval functionality for state, as a service. The state may include data saved by the application, which can be referred to as application save data.

The state server 206 provides content state information to devices, such as the playback device 208. In an illustrative embodiment, the information is provided across the network 210 to a requesting device. Typically, the state server 206 would first receive content state information from the playback device 208, to be retrieved later. However, the playback device 208 could conceivably request information provided by a different device (not shown), if the playback device 208 has the requisite permissions. Alternatively, the state server 206 could store preconfigured state that the playback device 208 may request.

In the example of FIG. 2, the playback device 208 may include any of a variety of devices including, but not limited to, a mobile device, game console, personal digital assistant (“pda”), cellular phone, smart phone, computer, appliance, portable, or some other device that includes a computer-readable medium. Such devices may include a variety of components (not shown) including, by not limited to, a processor, memory, non-volatile storage, an input/output controller or device, a display, and/or other known or convenient components.

In operation, the playback device 208 obtains an E-ticket from the license server 202 across the network 210. The license server 202 may provide the E-ticket in response to a request from the playback device 208 (i.e., pull) or the license server 202 may push the E-ticket to the playback device 208. In order to push the E-ticket, the playback device 208 must typically be pre-approved, which may be accomplished by some other device (not shown) that obtains the E-ticket for the playback device 208, or the license data could be input directly by a human or artificial agent at the license server 202. For illustrative purposes, in some descriptions provided herein, the E-ticket is obtained before a request for content, though it should be understood that the E-ticket could be provided concurrently with content, or even after content has already been received at the playback device 208.

In operation, the playback device 208 obtains content from the content server 204. The content server 204 may provide the content in response to a request from the playback device 208. The content server 204 may or may not require that the playback device 208 have permission to execute the content prior to providing the content. For example, the playback device 208 may be a secure playback device that can download content, but cannot play the content until the playback device has permission. This may be useful, by way of example but not limitation, when providing demo software to a playback device 208. If the user of the playback device 208 likes the demo, he could obtain permission to “unlock” additional (e.g., paid) features of the software without an additional content download. As another example, a conditional license could grant permissions to additional content when certain conditions are met. Hereinafter, for illustrative simplicity, only content that is downloaded to the playback device 208 to which the playback device 208 has permission is discussed (even though the playback device 208 may not have permission to all of a content download, or permissions may be conditional).

In operation, the playback device 208 executes the content. When content is executed, runtime state may be generated. Runtime state is intended to be more than simply data used in, e.g., a conditional license, such as duration of play or number of times executed. Rather, a first runtime state for content to which the playback device 208 has permission would result in a different experience than a second runtime state for the same content. An example of runtime state is what level of a game has been reached, the possessions of an avatar in a roleplaying game, or the number of gold coins collected in an adventure game.

In operation, the content may be deleted from the playback device 208. Before, concurrently with, or after the content is deleted, the playback device 208 sends state (e.g., game save data) associated with the content to the state server 206. Thus, the content and the content state can be deleted from the device, e.g., to increase the amount of storage on the playback device 208. The E-ticket associated with the content is not deleted from the playback device 208. The E-ticket enables the playback device 208 to recover the deleted content from the content server 204 (or some other content server). Advantageously, the E-ticket also enables the playback device 208 to recover the runtime state from the state server 206.

In an alternative, the playback device 208 could delete even the E-ticket. In such an embodiment, there should be some way for the playback device 208 to recover the license. This could be accomplished in any known or convenient manner, such as, by way of example but not limitation, requiring a user of the playback device 208 to enter a password to get a new E-ticket from the license server 202 (or some other E-ticket server). After recovering the E-ticket, the playback device 208 could then recover the content and the runtime state associated with the content, as described previously.

FIG. 3 depicts an example of a flow diagram 300 appropriate for the content management system 200 (FIG. 2). For illustrative purposes arrows in the example of FIG. 3 depict various transactions between the components over time. The arrows are numbered to illustrate temporal position, though the order of the transactions could be varied, and one or more of the transactions could be implemented outside of the described flow.

In the example of FIG. 3, in a first transaction (transaction 1) the license server 302 provides an E-ticket to the playback device 308. The E-ticket may be provided in response to a request (e.g., in a pull transaction) or it may be pushed. The E-ticket may include permissions to content stored on the content server 304; a unique identifier (UID) associated with the user, playback device 308, or both; a title; a title ID; content size; and/or other implementation- or embodiment-specific data.

In the example of FIG. 3, in transaction 2, the playback device 308 sends a request, including permissions, to the content server 304. The playback device may send additional permissions information with the request, such as a copy of the E-ticket, or a subset of the information from the E-ticket to prove it has the rights to the content.

In the example of FIG. 3, in optional transaction 3, the content server 104 queries the license server 302. If the permissions from the playback device 108 do not include sufficient information to prove the playback device 308 has a license to content, the content server 304 may optionally query the license server 302. The query may use the permissions data to determine whether the playback device 308 actually has permission to receive the content.

In the example of FIG. 3, in transaction 4, the content server 304 provides, in response to the request from the playback device 308, content to the playback device 308. At some point after receiving the content, in transaction 5, the playback device 308 executes the content and generates runtime state.

In the example of FIG. 3, in transaction 6, the playback device 308 provides the runtime state associated with the content to the state server 306. The playback device 308 may also provide sufficient identifying information that the playback device 308 may later request that the state server 306 provide the saved state. The point at which the playback device 308 provides the runtime state may vary depending upon implementation- or embodiment-specific stimuli, or upon user preferences. For example, the playback device 308 may be configured to send runtime state every evening at midnight, or when the content with which the runtime state is associated is deleted. The server may be configured to check a cryptographic signature on the state data to authenticate it. The authenticity is checked by using a device certificate that is made available to the server. The device certificate includes an identity to tie the user making the request to the one who owns the state and the content.

In the example of FIG. 3, in transaction 7, the runtime state is deleted at the playback device 308. It should be noted that the content may be deleted before, concurrently with, or after the content state is deleted; or the content may not be deleted at all. Moreover, it is not necessarily the case that runtime state would be deleted. For example, the playback device 308 could request old runtime state even if the current runtime state is more recent.

In the example of FIG. 3, in transaction 8, the playback device 308 provides permissions to the state server 306. The permissions may or may not be the same as were sent to the content server 304 in transaction 2. It is conceivable that the content server 304 could be implemented with greater security, requiring more secure permissions than that of the state server 306. Nevertheless, the state server 306 may still, in optional transaction 9, query the license server 302 to verify permissions. Finally, in transaction 10, the state server 306 provides the state to the playback device 308.

FIG. 4 depicts an example of a playback device 400 including a content state recovery engine. The playback device 400 includes an interface 402, an E-tickets database (dB) 404, a content dB 406, a content state dB 408, a content state recovery engine 410, and a bus 420 to which each of the components is coupled. It should be noted that a bus architecture is but one known electronic implementation for a computer system, though any known or convenient implementation may be used in lieu of a bus architecture.

The interface 402 may be used to communicate with a communications network or an external device in a manner that is known or convenient. E-tickets, for storage in the E-tickets dB 404 may be received on the interface 402. Similarly, content may be received on the interface 402 for storage on the content dB 406. In an illustrative embodiment, the content state dB includes runtime state associated with content, whether the runtime state is generated locally on the playback device 400 and/or is recovered from an external state database. The content state recovery engine 410 recovers state for the playback device 400. The content state recovery engine 410 may also be responsible for sending state on the interface 402 (for external storage and later recovery).

FIG. 5 depicts a flowchart 500 of an example of a method in which a server could distribute content in a network including a playback device of limited storage capacity. The flowchart 500 begins with module 502 where a request is received for content.

In the example of FIG. 5, the flowchart 500 continues to module 504 where information associated with the playback device is obtained. The information may include, for example, the available storage space on the playback device. The flowchart 500 continues to module 506 where information associated with the content is obtained. The information may include, for example, the amount of storage space needed for the content.

In the example of FIG. 5, the flowchart 500 continues to decision point 508 where it is determined whether sufficient storage space is available to store the content on the playback device. If there is sufficient storage (508-Y), then an E-ticket and the content is sent to the playback device. If, on the other hand, there is not sufficient storage (508-N), then an E-ticket is sent to the playback device, but content is sent to external storage. Then the flowchart 500 ends.

FIG. 6 depicts a flowchart 600 of an example of a method for providing virtual vault services. In the example of FIG. 6, the flowchart 600 starts at module 602 with providing storage and retrieval services for title content and user-generated state data owned by the user. User-generated state data may include, by way of example but not limitation, game save data, application save data, runtime state, or other state that is created at a playback device in the course of executing the title content.

In the example of FIG. 6, the flowchart 600 continues to module 604 with cryptographically authenticating a signed E-ticket, including at least a title and a user or device identity, to validate a request for a title or state data associated with the user. Advantageously, external storage can save content and state data for a given user (or device identity). The user can then recover the content using a relatively small footprint E-ticket (i.e., an E-ticket having a significantly smaller footprint than the content and/or the content state).

In the example of FIG. 6, the flowchart 600 continues to module 606 with cryptographically authenticating a device or user-generated signature to establish the validity of state data before accepting the storage of user-generated state data. Advantageously, unauthorized users or devices cannot use up storage resources of the virtual vault, ensuring that only valid users can do so.

As used herein, the term “embodiment” means an embodiment that serves to illustrate by way of example but not limitation.

It will be appreciated to those skilled in the art that the preceding examples and embodiments are exemplary and not limiting to the scope of the present invention. It is intended that all permutations, enhancements, equivalents, and improvements thereto that are apparent to those skilled in the art upon a reading of the specification and a study of the drawings are included within the true spirit and scope of the present invention. It is therefore intended that the following appended claims include all such modifications, permutations and equivalents as fall within the true spirit and scope of the present invention. 

What is claimed is:
 1. A system comprising: a network; a content server, wherein in operation, the content server: receives a request for content from a single playback device coupled to the network; provides, in response to the request, the content to the single playback device if the single playback device has sufficient storage to store the content; provides, in response to the request, the content to external storage if the single playback device does not have sufficient storage to store the content; a license server coupled to the content server, wherein in operation, the license server: generates a license for the content, the license being stored locally at the license server; provides an electronic ticket (“e-ticket”) to the single playback device, the e-ticket including permissions associated with the license and an identification of the content; a state server coupled to the content server, wherein in operation, the state server: receives from the single playback device content state information corresponding to a state of the content when the content is deleted from the single playback device, verifies a cryptographic signature of the content, the verification of the cryptographic signature authenticating the content state information before accepting storage of the content state information, the cryptographic signature verified using a device certificate including an identity to tie the single playback device to an entity owning the state of the content and the content, and provides, in response to a request from the single playback device, the request including the e-ticket including the permissions associated with the license and the identification of the content, the content state information to the single playback device, thereby managing storage and retrieval of the state of the content after the content has been deleted from the single playback device; wherein the single playback device has the permission to execute the content in accordance with the state of the content provided in the content state information.
 2. The system of claim 1, wherein the single playback device is selected from the group of devices consisting of mobile device, game console, PDA, cellular phone, smart phone, computer, appliance, and electronic device that includes a computer readable medium.
 3. The system of claim 1, further comprising a user database coupled to the license server, including data associated with at least one of the single playback device and a user of the single playback device.
 4. The system of claim 1, wherein the single playback device comprises a content database coupled to the content server, including known or convenient content.
 5. The system of claim 1, wherein the single playback device comprises a state database coupled to the state server, including content state information associated with the content and the single playback device, a user of the single playback device, or both.
 6. The system of claim 1, wherein the license server and the content server are local with respect to one another.
 7. The system of claim 1, wherein the state server and the content server are local with respect to one another.
 8. The system of claim 1, wherein the request from the single playback device triggers a response that includes the content and the content state information associated with the content.
 9. The system of claim 1, wherein in operation, the license server provides the e-ticket to the single playback device when the single playback device does not have sufficient storage to store the content.
 10. The system of claim 1, wherein in operation, the content server provides the content to the single playback device responsive to a content request from the single playback device, and queries the license server when permission information that is received along with the content request does not include sufficient information to approve use of the content by the single playback device.
 11. The system of claim 1, wherein in operation, the state server queries the license server to verify permission information included in the request.
 12. The system of claim 1, wherein in operation, if the e-ticket is deleted from the single playback device, the license server provides to the single playback device a new e-ticket including the permissions associated with the license and the identification of the content, the new e-ticket being generated using information from the license stored at the license server.
 13. A method comprising: receiving, by a content server, a request for content from a single playback device coupled to the network; providing, by the content server in response to the request, the content to the single playback device if the single playback device has sufficient storage to store the content; providing, by the content server in response to the request, the content to external storage if the single playback device does not have sufficient storage to store the content; generating, by a license server, a license for the content, the license being stored at the license server; providing, by the license server, an electronic ticket (“e-ticket”) to the single playback device, the e-ticket including permissions associated with the license and an identification of the content; receiving, by a state server from the single playback device, content state information corresponding to a state of the content when the content is deleted from the single playback device, verifying, by the state server, a cryptographic signature of the content, the verification of the cryptographic signature authenticating the content state information before accepting storage of the content state information, the cryptographic signature verified using a device certificate including an identity to tie the single playback device to an entity owning the state of the content and the content, and providing, by the state server in response to a request from the single playback device, the request including the e-ticket including the permissions associated with the license and the identification of the content, the content state information to the single playback device, thereby managing storage and retrieval of the state of the content after the content has been deleted from the single playback device; wherein the single playback device has the permission to execute the content in accordance with the state of the content provided in the content state information.
 14. The method of claim 13, wherein the single playback device is selected from the group of devices consisting of mobile device, game console, PDA, cellular phone, smart phone, computer, appliance, and electronic device that includes a computer readable medium.
 15. The method of claim 13, further comprising storing, by a user database coupled to the license server, data associated with at least one of the single playback device and a user of the single playback device.
 16. The method of claim 13, further comprising storing, by a content database coupled to the single playback device, known or convenient content.
 17. The method of claim 13, further comprising storing, by a state database coupled to the state server, content state information associated with the content and the single playback device, a user of the single playback device, or both.
 18. The method of claim 13, wherein the license server and the content server are local with respect to one another.
 19. The method of claim 13, wherein the state server and the content server are local with respect to one another.
 20. The method of claim 13, further comprising providing, by the license server, the e-ticket to the single playback device when the single playback device does not have sufficient storage to store the content.
 21. The method of claim 13, wherein if the e-ticket is deleted from the single playback device, the method further comprises providing, by the license server to the single playback device, a new e-ticket including the permissions associated with the license and the identification of the content, the new e-ticket being generated using information from the license stored at the license server. 